If Elon Musk's Master Plan 4 is successful and leads to significant advancements or improvements in Tesla's operations, such as new product launches, increased production efficiency, or significant growth in market share, it could positively impact Tesla's stock price. However, the actual impact on the stock price would also depend on how these achievements compare to investor expectations and broader market trends.

Investors typically look at several factors when assessing the potential impact of strategic plans on stock prices, such as:

1. **Revenue Growth**: Increases in sales and revenue due to new products or market expansion.

2. **Profit Margins**: Improvements in production efficiency or cost reductions that enhance profitability.

3. **Market Penetration**: Success in entering new markets or increasing market share in existing markets.

4. **Technological Advancements**: Innovations that give Tesla a competitive edge.

5. **Macroeconomic Conditions**: Broader economic factors that can influence market sentiment and investment behavior.

Ultimately, while a successful implementation of Master Plan 4 could be a positive catalyst for Tesla's stock, predicting whether it will specifically reach $200 is speculative and should be approached with caution.